IAA authors:
Gordillo-Vazquez, Francisco J.;Luque, Alejandro;Pérez-Invernón, Francisco Javier
Authors:
Heumesser, Matthias;Chanrion, Olivier;Neubert, Torsten;Christian, Hugh J.;Dimitriadou, Krystallia;Gordillo-Vazquez, Francisco J.;Luque, Alejandro;Pérez-Invernón, Francisco Javier;Blakeslee, Richard J.;Østgaard, Nikolai;Reglero, Victor;Köhn, Christoph
Journal:
Geophysical Research Letters
Abstract:
The Atmosphere Space Interactions Monitor measures Terrestrial Gamma Ray Flashes (TGFs) simultaneously with optical emissions from associated lightning activity. We analyzed optical measurements at 180-230, 337, and 777.4 nm related to 69 TGFs observed between June 2018 and October 2019. All TGFs are associated with optical emissions and 90% of them are at the onset of a large optical pulse, suggesting that they are connected with the initiation of current surges. A model of photon delay induced by cloud scattering suggests that the sources of the optical pulses are from 0.7 ms before to 4.4 ms after the TGFs, with a median of -10 ± 80 µs, and 1-5 km below the cloud top. The pulses have rise times comparable to lightning but longer durations. Pulse amplitudes at 337 nm are ∼3 times larger than at 777.4 nm. The results support the leader streamer mechanism for TGF generation.
URL:
https://ui.adsabs.harvard.edu/#abs/2021GeoRL..48.0700H/abstract
Keywords:
ASIM;Cloud Optics;Leader;Streamer;TGF